/Engine/Source/Editor/BlueprintGraph/Classes/BlueprintTypePromotion.h
Determine what type a given set of wildcard pins would result in
Pin type that is the "highest" of all the given pins
static [FEdGraphPinType](API\Runtime\Engine\EdGraph\FEdGraphPinType) GetPromotedType ( const [TArray](API\Runtime\Core\Containers\TArray)< [UEdGraphPin](API\Runtime\Engine\EdGraph\UEdGraphPin) * > & WildcardPins )